108 



■UNITED STATES NATIONAL MtJSEXJM BULLETIN 2X5 



Family Hantkeninidae Cushman, 1927 



Subfamily Hastigerininae BoUi, Loeblich, and 

 Tappan, 1957 



Genus Hastigerina Thompson, 1876 



Hastigeiina cf. aequilateralis (Brady) 



Plate 22, Figttkes la-2b 



Globigerinella aequilateralis (Brady) Bebmudez, Cushman. Lab. 

 Foram. Res. Spec. Publ. 25, p. 280, pi. 21, fig. 51, 1949. 



Stkatigraphic range (in Lengua formation): Glo- 

 horotalia mayeri zone to Globorotalia menardii zone. 



Locality: Figured specimens (USNM P5601a,b) 

 from the Globorotalia menardii zone, from a subsurface 

 section. 



Kemaeks : Scarce specimens of Hastigerina are foimd 

 in the Lengua formation. They are slightly more 

 involute than Brady's types and are therefore listed 

 as H. cf . aequilateralis. 



Subfamily Cassigerinellinae BoUi, Loeblich, and 

 Tappan, 1957 



Genus Cassigerinella Pokorny, 1955 

 Cassigerinella cbipolensis (Cushman and Ponton) 



Plate 22, Figtjees 3a-c 



Cassidulina chipolensis Cushman and Ponton, Florida Geol. 

 Surv. Bull. 9, p. 98, pi. 15, figs. 2a-c, 1932. — Cttshman and 

 Stainfobth, Cushman Lab. Foram. Res., Spec. Publ. 

 14, p. 64, pi. 12, fig. 5. 



Stkatigraphic range (in Cipero formation): 

 Globigerina ampliapertura zone to Globorotalia fohsi 

 robusta zone. 



Locality: Figured hypotype (USNM P5602) from 

 the type section of the Globorotalia opima opima zone, 

 sample JS 20 (TTOC 193265). 



Remarks: Cassigerinella chipolensis is restricted to 

 the Cipero formation. The very small species is easily 

 recognizable. 



Family Orbulinidae Schultze, 1854 



Subfamily Globigerininae Carpenter, 1862 



Genus Globigerina d'Orbigny, 1826 

 Globigerina ampliapertura BoUi, new species 



Plate 22, Figures 4a-7b 



Shape of test trochospiral; spiral side almost flat to 

 slightly convex, umbilical side convex; equatorial 

 periphery lobate; axial periphery rounded. Wall 

 calcareous, perforate, surface finely pitted. Chambers 

 spherical in the early stage, becoming somewhat com- 

 pressed laterally in the last whorl; about 12, arranged 



in 2K whorls; the usually 4 chambers of the last whorl 

 increase rapidly in size. Sutures on spiral side radial 

 to oblique, depressed; on umbilical side radial, de- 

 pressed. Umbilicus fairly small, deep. Aperture a 

 high, distinct arch; interiomarginal, umbilical. Coiling 

 random. Largest diameter of holotype 0.55 mm. 



Stratigraphic range (in Cipero formation): Glo- 

 bigerina ampliapertura zone. 



Locality: Holotype (USNM P5603) and figured 

 paratype (USNM P5604), sample Bo SUA (TTOC 

 215658) and figured paratypes (USNM P5605a,b), 

 sample JS 19 (TTOC 193264), all from the Globigerina 

 ampliapertura zone, Cipero type section, Trinidad. 



Remarks: Globigerina ampliapertura, new species, is 

 distinguished from G. venezuelana in having a larger, 

 distinctly arched aperture. It differs from G. apertura 

 Cushman, which was described from the Miocene, in 

 having the chambers of the last whorl somewhat com- 

 pressed laterally and in the aperture being smaller in 

 relation to the chamber size. The G. apertura mentioned 

 by Bronnimana (1950, p. 80) from the Cipero formation 

 is a G. ampliapertura. The new species occurs also in 

 the upper Eocene. 



Globigerina parva BoUi, new species 

 Plate 22, Figures 14a-c 



Shape of test small, medium to high trochospiral; 

 equatorial periphery distinctly lobate. Wall calcareous, 

 perforate, surface smooth to very finely pitted. Cham- 

 bers spherical; 10-12, arranged in about 2H whorls; 

 the 4 or occasionally 5 chambers of the last whorl 

 increase moderately in size. Sutures on spiral side 

 radial, depressed; on umbilical side radial, depressed. 

 Umbilicus small. Aperture a medium to low arch; 

 interiomarginal, umbilical. Coiling random. Largest 

 diameter of holotype 0.25 mm. 



Stratigraphic range (in the Cipero formation): 

 Globigerina ampliapertura zone. 



Locality: Holotype (USNM P5606) from the 

 Globigerina ampliapertura zone, Cipero type section, 

 Trinidad, sample Bo 314A (TTOC 215658). 



Remarks: Globigerina parva, new species, is sep- 

 arated from the G. ciperoensis subspecies ia being more 

 trochospiral and in having usually 4 instead of 5 

 chambers in the last whorl. The new species occurs 

 also in the upper Eocene. 



Globigerina ciperoensis BoUi 



A considerable variation is observed within the species 

 Globigerina ciperoensis BoUi. The forms included orig- 

 inally in this species (BoUi, 1954) have a characteris- 

 ticaUy large umbUicus; they are now given subspecies 

 rank (G. ciperoensis ciperoensis). AU gradations occur 

 to forms with a smaU umbUicus associated with the 

 typical representatives, but those with smaUer umbiUcus 

 become predominant towards the end of the Globigerina 

 ciperoensis ciperoensis zone, where the typical G. cipe- 

 roensis ciperoensis disappear. They continue into the 

 Globorotalia kugleri zone and lower part of the Catapsy- 



